Telkom very bad service i am tired

I took at contract with Telkom for a Y7 and 10gig data. It was 2019 this contract expiried july 04 2021. Yet i am still billed i hve not got a call from telkom. They still bill me full amount as i am now getting 1gig data instead of 10gig. When i contact customer care you go through the machines it doesnt tale you direct to resolve the issue. The customer service person tells me that the contract in question is new. Taken in 2021 july 04. Ive asked for them to cancel it they said they cannot because its new contract. I am very angry but i need telkom to explain to me whats happening.